LTM4618(RevA) 데이터 시트보기 (PDF) - Linear Technology
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LTM4618
(Rev.:RevA)
(Rev.:RevA)
Linear Technology
LTM4618 Datasheet PDF : 24 Pages
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LTM4618
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full internal
operating temperature range, otherwise specifications are at TA = 25°C (Note 2), VIN = 12V, per typical application in Figure 21.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
IQ(VIN)
Input Supply Bias Current
IS(VIN)
Input Supply Current
INTVCC
Internal VCC Voltage
VEXTVCC
EXTVCC Switchover Voltage
VLDO External
EXTVCC Voltage Drop
VEXTVCC Hysteresis EXTVCC Hysteresis
Output Specifications
VIN = 12V, VOUT = 2.5V, IOUT = 0A
VIN = 26.5V, VOUT = 2.5V, IOUT = 0A
Shutdown, RUN = 0, VIN = 26.5V
VIN = 12V, VOUT = 2.5V, IOUT = 6A
VIN = 26.5V, VOUT = 2.5V, IOUT = 6A
VIN = 12V, VRUN > 2V, No Load
EXTVCC Ramping Positive
INTVCC = 20mA, VEXTVCC = 5V
26
mA
20
mA
80
μA
1.430
A
0.675
A
4.8
5
5.2
V
l 4.5 4.7
V
50 100
mV
200
mV
IOUT(DC)
Output Continuous Current Range
VIN = 12V, VOUT = 2.5V (Note 4)
0
ΔVOUT(LINE)
Line Regulation Accuracy
VOUT = 2.5V, VIN from 6V to 26.5V
VOUT
IOUT = 0A
l
ΔVOUT(LOAD)
VOUT
Load Regulation Accuracy
VIN = 12V, VOUT = 2.5V, 0 to 6A (Note 4)
l
VOUT(AC)
Output Ripple Voltage
IOUT = 0A, COUT = 100μF ×3 X5R Ceramic
VIN = 12V, VOUT = 2.5V
VIN = 26.5V, VOUT = 2.5V
fS
Output Ripple Voltage Frequency
IOUT = 2A, VIN = 12V, VOUT = 2.5V, VFREQ = INTVCC
ΔVOUT(START)
Turn-On Overshoot
COUT = 100μF ×3 X5R Ceramic
VOUT = 2.5V, IOUT = 0A
VIN = 12V
VIN = 26.5V
tSTART
Turn-On Time
COUT = 100μF ×3 X5R Ceramic,
VOUT = 2.5V, IOUT = 0A, TK/SS Capacitor = 0.01μF
VIN = 12V
VIN = 26.5V
ΔVOUTLS
Peak Deviation for Dynamic Load
Load: 0% to 50% of Full Load
COUT = 100μF ×3 X5R Ceramic, VOUT = 2.5V
VIN = 12V
tSETTLE
Settling Time for Dynamic Load Step
Load: 0% to 50% of Full Load
COUT = 100μF ×3 X5R Ceramic, VOUT = 2.5V
VIN = 12V
IOUT(PK)
Output Current Limit
COUT = 100μF ×3 X5R Ceramic
VIN = 6V, VOUT = 2.5V
VIN = 26.5V, VOUT = 2.5V
Control Section
6
A
0.02 0.04 %/V
0.3 0.6
%
10
mV
12
mV
780
kHz
20
mV
20
mV
0.75
ms
0.70
ms
15
mV
10
μs
11
A
11
A
VFB
Error Amplifier Feedback Voltage
IOUT = 0A, VOUT = 2.5V
0.792 0.8 0.808
V
l 0.788 0.8 0.808
V
IFB
VOVL
ITK/SS
DFMAX
tON(MIN)
fNOM
fLOW
Error Amplifier Feedback Current
Feedback Voltage Lockout
Soft-Start Charge Current
Maximum Duty Factor
Minimum On-Time
Nominal Frequency
Lowest Frequency
(Note 3)
Measured at VFB
VTK/SS = 0V
In Dropout (Note 3)
(Note 3)
VFREQ = 1.2V
VFREQ = 0V
–10 –50
nA
0.84 0.86 0.88
V
0.9 1.3 1.7
μA
97
%
90
ns
450 500 550 kHz
210 250 290 kHz
4618fa
3
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